[sip-h323] Re: H323/SIP Interworking - way forward

Wed Mar 8 11:41:42 EST 2000

Hi, David and Orit:

David has a raised an interesting point.

I guess that we can start with an interworking GW approach first: SIP
Network and H.323 Network.

Replacing GK and SIP server with a super server is an interesting idea. One
way of looking into it may be that the supper server contains the properties
of the SIP-H.323 interworking GW.

Best regards,
Radhika R. Roy
AT&T

> -----Original Message-----
> From: Wang, Dave [SMTP:dwang at NUERA.COM]
> Sent: Tuesday, March 07, 2000 6:28 PM
> To:   ITU-SG16 at MAILBAG.INTEL.COM
> Subject:      Re: [sip-h323] Re: H323/SIP Interworking - way forward
>
> Hi Orit,
>
> To support and extend existing install base, let say an existing H.323
> network, with working GW and GK, how would we add this super-Server ?
> Would
> we need to remove existing GK first ?
>
> In cases that we want to connect a working H.323 network with a working
> SIP
> network operated by two separate administrations, not sure how to replace
> both GK and SIP Server with a single super-Server ?
>
> David
>
> > -----Original Message-----
> > From: Orit Levin [mailto:orit at radvision.com]
> > Sent: Tuesday, March 07, 2000 12:25 PM
> > To: sip-h323 at egroups.com; ITU-SG16 at MAILBAG.INTEL.COM
> > Subject: [sip-h323] Re: H323/SIP Interworking - way forward
> >
> >
> > Hello folks!
> > Scoping our work in terms of scenarios...
> > There are a lot of possible topologies that we would like to
> > address. It
> > will be difficult to prioritize among them because it depends on each
> > company niche. I think that an exercise, done by the authors of
> > "Interworking Between SIP/SDP and H.323" Internet Draft, is a
> > great example
> > for this statement. In all cases it would involve Gatekeeper/Proxy and
> > Gateway of some kind, as either logical or physical entities.
> >
> > In my opinion, the first requirement for our work should be
> > defined as: "the
> > end devices should be interoperable regardless of signaling
> > protocol they
> > support". The fastest way to address this requirement is to cover the
> > topology where the end users are connected to a super-Server
> > supporting
> > both H.323 and SIP and solving the IWF as an internal logic (including
> > address translation). The outcome of this work should be the
> > recognition of
> > protocols' details or/and features preventing from transparent (to the
> > users) interworking. Then we can either profile further or,
> > alternatively,
> > feed the new requirements into the protocols.
> >
> > It is, by no means, prevents us from discussion about more complicated
> > topologies. Nevertheless, without solving the simplest case,
> > it is hard to
> > get focused.
> > My two cents,
> > Orit Levin
> > RADVision Inc.
> > 575 Corporate Drive Suite 420
> > Mahwah, NJ 07430
> > Tel: 1 201 529 4300  (230)
> > Fax: 1 201 529 3516
> > www.radvision.com
> > orit at radvision.com
> > -----Original Message-----
> > From: Kundan Singh <kns10 at cs.columbia.edu>
> > To: 'sip-h323 at egroups.com' <sip-h323 at egroups.com>
> > Date: Tuesday, March 07, 2000 10:51 AM
> > Subject: [sip-h323] Re: H323/SIP Interworking - way forward
> >
> >
> > >
> > >> Hi Paul,
> > >>
> > >> Thanks for the understanding. I like your ideas very much
> > and would love
> > to
> > >> limit my implementation to just this five. How about we
> > all bounce this
> > with
> > >> other contacts of ours and see how long this can hold up.
> > >>
> > >> My one remainimg question, in regards to the trivial cases
> > that we ruled
> > out
> > >> early on that doesn't involve any IWF : how does we know
> > a-prior that we
> > >> don't need, or need, the IWF ? Therefore, from a end-to-end service
> > >> prespective, i.e. above the protocol conversion, we would
> > still need to
> > have
> > >> a way to identify when IWF is needed.
> > >
> > >This functionality may be provided by the registration servers
> > >(e.g., SIP registrars and H.323 gatekeepers) present in the
> > >network. Ideally, one H.323 gatekeeper with SIP/H323 IWF
> > >listening at the gatekeepers multicast address can resolve
> > >all address requests originated from H.323 network and
> > >destined for a SIP entity. So an H.323 entity just need to
> > >send LRQ to the gatekeeper's welknown multicast address
> > without knowing
> > >whether the destination is in SIP or H.323 network.
> > >GK/IWF will capture the message find out if the
> > >destination is reachable in SIP network (e.g., using SIP
> > >OPTIONS message).
> > >
> > >In the other direction, its simple. Since the GK is equipped with
> > >IWF (SIP/H323 translation) it can forward all H.323 registrations to
> > >the SIP server. So, the H323 entities can be reached through that
> > >particular SIP server.
> > >
> > >Likewise, SR/IWF may also be used to provide transparent
> > >address resolution.
> > >
> > >However, it would be nice if the IWF is not part of
> > >a regitration server and, still, can resolve the address.
> > >
> > >Regards
> > >
> > >Kundan
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >-------------------------------------------------------------
> > -----------
> > >To Post a message, send it to:   sip-h323 at eGroups.com
> > >To Unsubscribe, send a blank message to:
> > sip-h323-unsubscribe at eGroups.com
> > >
> > >-------------------------------------------------------------
> > -----------
> > >DON'T HATE YOUR RATE!
> > >Get a NextCard Visa, in 30 seconds!  Get rates as low as
> > >0.0% Intro or 9.9% Fixed APR and no hidden fees.
> > >Apply NOW!
> > >http://click.egroups.com/1/2065/2/_/302437/_/952444292/
> > >
> > >eGroups.com Home: http://www.egroups.com/group/sip-h323/
> > >http://www.egroups.com - Simplifying group communications
> > >
> > >
> >
> >
> > --------------------------------------------------------------
> > ----------
> > To Post a message, send it to:   sip-h323 at eGroups.com
> > To Unsubscribe, send a blank message to:
> > sip-h323-unsubscribe at eGroups.com
> >
> > --------------------------------------------------------------
> > ----------
> > Planning a party? iParty.com is your complete source for
> > party planning and
> > supplies, with everything you need to throw the perfect party!
> > http://click.egroups.com/1/1635/2/_/302437/_/952460660/
> >
> > -- Check out your group's private Chat room
> > -- http://www.egroups.com/ChatPage?listName=sip-h323&m=1
> >
> >